Traxxas performance differential oils make it easy to increase or decrease the limited slip action of the gear differential. Depending on the track conditions, altering the limited slip capability can enhance turning performance for faster exit speeds. Higher weights result in more differential locking action. Try multiple weights to find the best combination for your needs. Use Traxxas stock and hop-up replacement parts to get the most out of your Traxxas RTR vehicles. This product is made from high quality materials and designed for long-lasting performance. This is replacement hardware for use on Traxxas vehicles; consult your users manual for exact parts listings.